The bite block (BB, Fig.8) of the removable appliance is placed between the top and bottom back teeth so that the top front teeth (1) are unlocked.  That is, there is a space between the top and bottom front teeth (>) so that the top front teeth are free to move forward due to the action of the springs.

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Xin Wei, DDS, PhD, MS 1st edition 08/09/2014, last revision 08/10/2014